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Dynamo Light problems

  • 14-09-2011 11:03am
    #1
    briano101
    Registered Users Posts: 12 ✭


    Hello,

    has anyone had a similar problem with dynamo bicycle lights? My front ligh t works off the dynamo fine but the back light doesn't!
    I had the back light checked by the manufacturer and it is working fine. So obviously there is a problem with the mudguard providing a good circuit for the back light? Does anyone know of a way to check the mudguard for conductivity /circuitry?

    The wires from the dynamo on the front wheel check out fine until the back socket of the mudguard.

    any ideas appreciated

    regards
    briano101


Comments

  • #2
    Lumen
    Registered Users, Registered Users 2 Posts: 31,142 ✭✭✭✭Lumen


    The solution may depend on your dynamo and front light setup, but if you're having problems earthing it with a single wire you can use a twin wire, which will earth it back through the front.


  • #3
    BostonB
    Closed Accounts Posts: 18,056 ✭✭✭✭BostonB


    A auto electrician would probably sort it in a minute. even a mechanic.


  • #4
    Al Wright
    Registered Users, Registered Users 2 Posts: 168 ✭✭Al Wright


    A frequent problem with rear light directly fitted to a chromoplastic mudguard. Cause of problem can be broken link conductor or connecting stud making poor contact. (keep a lookout for special offer 10 euro multimeter from Aldi or Lidl, I found it invaluable in tracing dynamo faults)

    The following CTC thread may be of some use
    http://forum.ctc.org.uk/viewtopic.php?f=5&t=17072&p=135989&hilit=mudguard+mounted+rear+light#p135989


  • #5
    Civilian_Target
    Registered Users, Registered Users 2 Posts: 5,618 ✭✭✭Civilian_Target


    What's the dynamo type? Dynamos lights that earth to the frame are pretty fiddly about this - if you can link it to ground with a cable instead, it's usually a more reliable way to do it.


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